.

Things to remember while scuba diving

Dive briefing

  • Passenger check in (/w reconfirmation)
    • name
    • c-card, #dives
    • contact phone #
    • waver
    • buddy assignments
  • Gear storage rules
    • you have everything?
    • where and how to store equipment
    • anything on the deck gets wet
    • game / camera storage.
  • Vessel orientation
    • terminology
    • off-limits areas
    • emergency equipment, Paramedics 911, DAN (919) 684.8111, Marine Ch.16
    • convenience items
  • On-deck rules review
    • assemble before departure
    • work from your dive bag
    • do not take up excessive space
    • marked equipment, no fins on board, no tanks over-head
    • always face a ladder while climbing up or down.
  • Safety rules
    • buddy separation (4ft up and search for 1 min., surface to reunite)
    • out-of-air (watch tank pressure, carry alternate air source)
    • entanglement (not fight, ensure adequate air supply, work slowly to free)
    • strong current (not fight, establish positive buoyancy, rest and drift, dispatch assistance)
    • recall procedures
  • Area orientation
    • characteristics of the site
    • depth range, NDL
  • Entry/exit orientation
    • Be SAFE (18 m/min.), 3 min. @ 5m.
    • Ascend along a line.
    • Inflate BCD, signal OK.
    • Swim back to the boat and wait your turn (hang on to stern line).  Not under a diver who is climbing a ladder.
    • Use the swells to carry you on the swim step/stern platform.
    • One diver at a time.
    • Don’t remove your fins until you’ve made firm contact.
  • Your role during the dive
  • Overall difficulty rating.
  • “Begin With Review And Friend”

Pre-dive

Safety check review

  1. BCD: connection + sufficient air
  2. Weights
  3. Releases: accessible
  4. Air: full and turned on
  5. Final OK: don fins, regulator, swim away and signal OK.
  6. “Go down” signal /w confirmation
  7. Visual reference (set compass)
  8. Snorkel to regulator
  9. Note time
  10. Hold inflator

Descent review

  • You should equalize your air spaces every few meters while descending, before you feel discomfort.
  • If you feel discomfort in your ear while descending, ascend until discomfort is gone, attempt to equalize once again and continue a slow descent.
  • Free descent: Take care to avoid disorientation, watch your descent rate, maintain buddy contact.
  • The most important rule in scuba diving is: Breathe continuously and never hold your breath.
  • Stay in front of the vessel.
  • On board with min. 20…40 bar.
  • Use the stern line if behind the vessel.

While diving divers should

Ascend review

  1. “go up” signal /w confirmation.
  2. Note time.
  3. Hold inflator up
  4. One hand up
  5. Look upwards

Post-dive / Exit

  • Inflate BCD at the surface and signal OK
  • If you feel discomfort during ascent due to air expansion in any body air space during ascent slow or stop your ascent, descent a few meters and allow the trapped air to work its way out.
  • Board one diver at a time, while others stay well clear.
  • Prepare to immediately lend assistance.
  • Ascertain dive profiles.
  • Remind to clear the exit area.
  • Visually confirm that everyone is aboard and accounted for (roll-calls).
  • Observe for delayed response to diving related problems.
Coert Vonk

Coert Vonk

Independent Firmware Engineer at Los Altos, CA
Welcome to the things that I couldn’t find.This blog shares some of the notes that I took while deep diving into various fields.Many such endeavors were triggered by curious inquiries from students. Even though the notes often cover a broader area, the key goal is to help the them adopt, flourish and inspire them to invent new technology.
Coert Vonk

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